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Vegetation dynamics and successional processes are explained in a natural aquatic
ecosystem, the natural lake „Heiliges Meer“ in North Western Germany. Here we find typical
life in aquatic and amphibious habitats, and we learn to combine our work to understand
the ecology of plant communities in natural lakes depending on their ability to sense and exploit
the environment. Of themany variables which amphibious and aquatic plants experience,
many factors, the vegetation history, the succession, the trophical status and the anthropozoogenic
influences play a major role in determining the habitats of aquatic, amphibious and
semiterrestrial plant communities of Potamogetonion- , Phragmition-, Salicion- and Alnion-alliances. The fundamental impact of natural radiation of Phragmites-species is explained
by aspects of genetically diversity of common reed withmicrosatellites and RAPD analysis,
as well as the natural impact of the muskrat Ondatra zibethicus in the last years.